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Old 07-18-2006, 10:05 PM   #1
LQ Newbie
Registered: Jul 2006
Posts: 17

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can't display xwindow on remote machine using Debian 3.1

I am runnig Debian (Sarge) 3.1 on a LAN.
I want to open xwindow on a remote machine.

Two machines: Machine A and Machine B

I am logged in A.
1. I gave command: xhost + B
2. ssh to machine B.

3. Now while in machine B wrote command:
export DISPLAY=A:0.0
4. xterm

I see error message: xterm Xt error: Can't open display

I also made following change in /etc/ssh/sshd_config:
X11Forwarding yes
(Above change was made made for both the machines A and B). I also rebooted A & B after this change, but to no avail. (I also tried the same thing while on machine B.)

Your help is greatly appreciated.

Last edited by linian; 07-19-2006 at 09:24 AM.
Old 07-19-2006, 03:22 AM   #2
LQ Guru
Registered: Aug 2003
Distribution: CentOS, OS X
Posts: 5,131

Rep: Reputation: Disabled
Did you try to open the ssh connection using
ssh -X
(enable X11) or
ssh -Y
(enable trusted X11 - remember to make B "trusted")

instead of plain "ssh"?
Old 07-19-2006, 09:32 AM   #3
LQ Newbie
Registered: Jul 2006
Posts: 17

Original Poster
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After your advice I tried it as:

xhost + remotehost
ssh -X machineB -l username
....export DISPLAY....

also as:

xhost + remotehost
ssh -Y machineB -l username
....export DISPLAY....

But both ways, I get the following error
xterm Xt error: Can't open display: machineA:0.0

Last edited by linian; 07-20-2006 at 09:52 AM.
Old 07-20-2006, 09:40 AM   #4
LQ Newbie
Registered: Jul 2006
Posts: 17

Original Poster
Rep: Reputation: 0
Hello b0uncer,
I GOT THAT. NOW IT is working fine. Thanks for your help.
Today I tried ssh -X without messing with xhost or export DISPLAY..etc.
That is : I did NOT write : xhost +hostname
I did not write: export DISPLAY....
I just wrote:
ssh -X hostname
and once I got into that host, then I wrote xterm.
It is working great.
Previously I was mixing ssh -X and then given command ..DISPLAY.. and then xterm. That is not a proper way.
Proper way is just as I described above. I wrote a detailed reply so that it can help anyone who reads this thread.

Thank you b0uncer. I appreciate taking your time and giving the response.
Best regards.


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